I have a sqlite (v3) table with this column definition:
\"timestamp\" DATETIME DEFAULT CURRENT_TIMESTAMP
The server that this database live
You can also just convert the time column to a timestamp by using strftime():
SELECT strftime('%s', timestamp) as timestamp FROM ... ;
Gives you:
1454521888
'timestamp' table column can be a text field even, using the current_timestamp as DEFAULT.
Without strftime:
SELECT timestamp FROM ... ;
Gives you:
2016-02-03 17:51:28